LPC47M182-NR SMSC [SMSC Corporation], LPC47M182-NR Datasheet - Page 185
LPC47M182-NR
Manufacturer Part Number
LPC47M182-NR
Description
ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.LPC47M182-NR.pdf
(223 pages)
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Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
SMSC LPC47M182
FDD Option Register
Default = 0x00
on VCC POR,
VTR POR and
HARD RESET
FDD Type Register
Default = 0xFF
on VCC POR,
VTR POR and
HARD RESET
FDD0
Default = 0x00
on VCC POR,
VTR POR and
HARD RESET
NAME
REG INDEX
0xF2 R/W
0xF1 R/W
0xF4 R/W
0xF3 R
0xF5 R
DATASHEET
Note: Bits[0, 2, 3] in this register are mapped to 0xF8
register.
Bit[0] Forced Write Protect
= 0
= 1
nWRTPRT (to the FDC Core) = WP (FDC SRA
register, bit 1) = (nDS0 AND Forced Write Protect)
OR (nDS1 AND Forced Write Protect) OR nWRTPRT
(from the FDD Interface)
Bit[1] Reserved
Bits[3:2] Density Select
= 00
= 01
= 10
= 11
Notes:
•
•
Bit[7:4] Reserved.
Bits[1:0] Floppy Drive A Type
Bits[3:2] Reserved (could be used to store Floppy
Drive B type)
Bits[5:4] Reserved (could be used to store Floppy
Drive C type)
Bits[7:6] Reserved (could be used to store Floppy
Drive D type)
Reserved, Read as 0 (read only)
Bits[1:0] Drive Type Select: DT1, DT0
Bits[2]
Bits[4:3] Data Rate Table Select: DRT1, DRT0
Bits[5]
Bits[6]
Bits[7]
Reserved, Read as 0 (read only)
=0 Use Precompensation
=1 No Precompensation
Setting Bits[3:2] to “01” will not change the state of
Bit[5] in the 0xF8 will not change.
Setting Bits[3:2] to “10” will not change the state of
Bit[5] in 0xF8 register; however, FDC logic will be
affected.
185
Read as 0 (read only)
Read as 0 (read only)
Precompensation Disable PTS
Read as 0 (read only)
Inactive (default)
FDD nWRTPRT input is forced active when
either of the drives has been selected.
Normal (default)
Normal (reserved for users)
1 (forced to logic “1”)
0 (forced to logic “0”)
DEFINITION
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
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